Add some comments regarding the project startup for the 1st time

Adding customer info into Order

code cleanup and better documentation

OrderItem direct endpoints

+ Orders

PATCH implemented for Customer and Product

tests refactoring (making use of Faker library)

"first_name" and "last_name" replaced by "name" column

Add README content and Makefile

validating email and make email unique in customer table

Customer implementation (still need to make email unique)

Implementing Product update & delete

Product: "get all" with search + pagination

improve Product validations and tests

Add tests support for the project + few tests for "create product"